API Testing Using Postman

Sending a Request

In Postman, choose an HTTP method (GET, POST, etc.), enter the endpoint URL, add any required headers or body content, and click "Send" to view the response.

Inspecting the Response

Postman displays the response status code, response time, response size, headers, and body — all in one panel, letting testers quickly assess whether the request succeeded as expected.

Adding Assertions

The "Tests" tab lets testers write JavaScript assertions (using the pm.test() function) that run automatically after the response arrives, turning a manual check into a repeatable automated one.